Php/docs/function.phpversion
phpversion
(PHP 4, PHP 5, PHP 7)
phpversion — Gets the current PHP version
Description
phpversion
([ string $extension
] ) : string
Returns a string containing the version of the currently running PHP parser or extension.
Parameters
extension
- An optional extension name.
Return Values
If the optional extension
parameter is
specified, phpversion() returns the version of that
extension, or FALSE
if there is no version information associated or
the extension isn't enabled.
Examples
Example #1 phpversion() example
<?php// prints e.g. 'Current PHP version: 4.1.1'echo 'Current PHP version: ' . phpversion();// prints e.g. '2.0' or nothing if the extension isn't enabledecho phpversion('tidy');?>
Example #2 PHP_VERSION_ID
example and usage
<?php// PHP_VERSION_ID is available as of PHP 5.2.7, if our // version is lower than that, then emulate itif (!defined('PHP_VERSION_ID')) { $version = explode('.', PHP_VERSION); define('PHP_VERSION_ID', ($version[0] * 10000 + $version[1] * 100 + $version[2]));}// PHP_VERSION_ID is defined as a number, where the higher the number // is, the newer a PHP version is used. It's defined as used in the above // expression://// $version_id = $major_version * 10000 + $minor_version * 100 + $release_version;//// Now with PHP_VERSION_ID we can check for features this PHP version // may have, this doesn't require to use version_compare() everytime // you check if the current PHP version may not support a feature.//// For example, we may here define the PHP_VERSION_* constants thats // not available in versions prior to 5.2.7if (PHP_VERSION_ID < 50207) { define('PHP_MAJOR_VERSION', $version[0]); define('PHP_MINOR_VERSION', $version[1]); define('PHP_RELEASE_VERSION', $version[2]); // and so on, ...}?>
Notes
Note:
This information is also available in the predefined constant
PHP_VERSION
. More versioning information is available using thePHP_VERSION_*
constants.
See Also
- PHP_VERSION constants
- version_compare() - Compares two "PHP-standardized" version number strings
- phpinfo() - Outputs information about PHP's configuration
- phpcredits() - Prints out the credits for PHP
- php_logo_guid()
- zend_version() - Gets the version of the current Zend engine